SNVS764Q – JANUARY 2000 – REVISED DECEMBER 2017
LP295x-N Series of Adjustable Micropower Voltage Regulators
1 Features
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3 Description
The LP2950-N and LP2951-N are micropower
voltage regulators with very low quiescent current
(75 µA typical) and very low dropout voltage (typical
40 mV at light loads and 380 mV at 100 mA). They
are ideally suited for use in battery-powered systems.
Furthermore, the quiescent current of the device
increases only slightly in dropout, prolonging battery
life.
Careful design of the LP2950-N/LP2951-N has
minimized all contributions to the error budget. This
includes a tight initial tolerance (0.5% typical),
extremely good load and line regulation (0.05%
typical) and a very low output voltage temperature
coefficient, making the part useful as a low-power
voltage reference.
One such feature is an error flag output which warns
of a low output voltage, often due to falling batteries
on the input. It may be used for a power-on reset. A
second feature is the logic-compatible shutdown input
which enables the regulator to be switched on and
off. Also, the part may be pin-strapped for a 5-V, 3-V,
or 3.3-V output (depending on the version), or
programmed from 1.24 V to 29 V with an external
pair of resistors.
The LP2950-N is available in the surface-mount TO-
252 package and in the popular 3-pin TO-92 package
for pin-compatibility with older 5-V regulators. The 8-
pin LP2951-N is available in plastic, ceramic dual-in-
line, WSON, or metal can packages and offers
additional system functions.
Device Information
PART NUMBER
LP2950-N
PACKAGE
TO-92 (3)
TO-252 (3)
SOIC (8)
LP2951-N
VSSOP (8)
WSON (8)
PDIP (8)
BODY SIZE (NOM)
4.30 mm × 4.30 mm
9.91 mm × 6.58 mm
4.90 mm × 3.91 mm
3.00 mm × 3.00 mm
4.00 mm × 4.00 mm
9.81 mm × 6.35 mm
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Input Voltage Range: 2.3 V to 30 V
5-V, 3-V, and 3.3-V Output Voltage Versions
Available
High Accuracy Output Voltage
Ensured 100-mA Output Current
Extremely Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line Regulation
Very Low Temperature Coefficient
Use as Regulator or Reference
Needs Minimum Capacitance for Stability
Current and Thermal Limiting
Stable With Low-ESR Output Capacitors (10 mΩ
to 6
Ω)
LP2951-N Versions Only:
– Error Flag Warns of Output Dropout
– Logic-Controlled Electronic Shutdown
– Output Programmable From 1.24 V to 29 V
2 Applications
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High-Efficiency Linear Regulator
Regulator with Undervoltage Shutdown
Low Dropout Battery-powered Regulator
Snap-ON/Snap-OFF Regulator
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LP2951 Simplified Schematic
LP2951
V
OUT
C
OUT
2.2
µF
SENSE
FEEDBACK
OUT
IN
V
IN
C
IN
1
µF
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
LP2950-N Simplified Schematic
LP2950
V
IN
SHUTDOWN
SHUTDOWN
VTAP
V
FEEDBACK
R1
330 k
IN
C
IN
1
µF
GND
OUT
V
OUT
C
OUT
2.2
µF
GND
ERROR
V
OUT
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TI [ TEXAS INSTRUMENTS ]
